Topsy announced it has indexed every public tweet. A search reveals the first tweet about Justin Bieber was sent five years ago.

Ever wondered who first mentioned Justin Bieber on Twitter? Now you can find out.

Social analytics firm Topsy announced it has indexed every public tweet that has ever been sent out and has made the information available to the public — a feat no one else, including Twitter, has been able to accomplish.

Topsy specializes in providing social data to companies, so it had already indexed many public tweets going back to July 2010.